answers

Hello
Connect a scan tool to see if mph is registering in data.if it is not registering on scan tool it is likely an issue at trans speed sensor or wiring to PCM. If you do see MPH data on scan tool it is likely a speedometer head issue or wiring issue between PCM and speedometer head. hope this helps.
Joe Boulay
Automotive Technician & Author[email protected]
www.joeboulay.com